181521941 has 2 divisors, whose sum is σ = 181521942. Its totient is φ = 181521940.

The previous prime is 181521929. The next prime is 181521983. The reversal of 181521941 is 149125181.

181521941 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105657841 + 75864100 = 10279^2 + 8710^2 .

It is a cyclic number.

It is not a de Polignac number, because 181521941 - 2¹⁴ = 181505557 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 181521898 and 181521907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181529941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90760970 + 90760971.

It is an arithmetic number, because the mean of its divisors is an integer number (90760971).

Almost surely, 2^181521941 is an apocalyptic number.

It is an amenable number.

181521941 is a deficient number, since it is larger than the sum of its proper divisors (1).

181521941 is an equidigital number, since it uses as much as digits as its factorization.

181521941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 32.

The square root of 181521941 is about 13473.0078675847. The cubic root of 181521941 is about 566.2084880399.

The spelling of 181521941 in words is "one hundred eighty-one million, five hundred twenty-one thousand, nine hundred forty-one".